How to choose lithotripsy unit ?

1. What is the focal zone of the lithotripter?
2. What is the peak pressure at the focal zone?
3. Is the energy delivery at focal zone consistent?
4. Is the energy delivered at focal zone adequate (not more than required for stone fragmentation)?
5. Do I have enough control over the energy delivered manually?
6. Do I have enough steps of increasing energy before I reach desired energy level?
7. Does every patient require anesthesia for lithotripsy?
8. Do I have dynamic monitoring of stone during lithotripsy?

Try to grade lithotripsy unit in following category.

Properties of lithotripsy		Machine A	Machine B	Machine C
Focal zone	Larger the better
Energy delivery at focal zone
Is the energy at focal zone constant
Control over the energy delivered manually	Does machine have manual selection of energy
Steps of increasing energy before you reach desired energy level	More the steps better
Patient require anesthesia (GA/SA)	Ideally no anesthesia or only analgesia should be required
Dynamic monitoring -USG	USG is better for Lithotripsy
Total score